Vagrant cannot install nokogiri-dependent plugins

Question

I\'m trying to install the rackspace plugin for vagrant (1.5.1):

vagrant plugin install vagrant-rackspace

But it complains

Answer 1

Warning: This is a super-hacky solution, though it's hard to call it that.

Yesterday I installed Vagrant on another OSX Mavericks box. Like many other posts I read on SO "all I had to do" was run xcode-select --install and bingo vagrant plugin install vagrant-rackspace worked like a charm.

Today I was mired down in the Bundler code again when it dawned on me that since this is an isolated ruby environment why not nuke my ~/.vagrant.d directory and copy the same directory from the successful build on the other box...

The result? A working vagrant rackspace on my laptop! I'm not sure I'll ever figure out what was really wrong, but if anyone wants a shot at the 100 point bounty, I'm still open to suggestions!